<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
     <!--[if lt IE 9]>
      <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
      <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
    <![endif]-->
    <link rel="stylesheet" href="Bootstrap/css/bootstrap.css">
    <title>前端框架</title>
    <style>
        [class^="col"] {
            background-color: green;
            height: 50px;
            border: 1px solid yellow;
        }
        
    </style>
</head>
<body>
    <div class="container">
        <div class="row">
            <div class="col-lg-3">1</div>
            <div class="col-lg-3">1</div>
            <div class="col-lg-3">1</div>
            <div class="col-lg-3">1</div>
        </div>
        <div class="row">
            <div class="col-lg-3">1</div>
            <div class="col-lg-3">1</div>
            <div class="col-lg-6">1</div>
        </div>
        <div class="row">
            <div class="col-lg-4">1</div>
            <div class="col-lg-4 col-lg-offset-4">1</div>
        </div>
          <div class="row">
            <div class="col-lg-6 col-lg-offset-3">1</div>
        </div>
    </div>
</body>
</html>